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Tomcat example source code file (SSIExec.java)

This example Tomcat source code file (SSIExec.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

buffer_size, bufferedreader, bufferedreader, couldn't, couldn't, interruptedexception, io, ioexception, printwriter, runtime, ssiexec, ssiinclude, ssiinclude, string, string

The Tomcat SSIExec.java source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.catalina.ssi;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import org.apache.catalina.util.IOTools;
 * Implements the Server-side #exec command
 * @author Bip Thelin
 * @author Amy Roh
 * @author Paul Speed
 * @author Dan Sandberg
 * @author David Becker
 * @version $Revision: 531303 $, $Date: 2007-04-23 02:24:01 +0200 (lun., 23 avr. 2007) $
public class SSIExec implements SSICommand {
    protected SSIInclude ssiInclude = new SSIInclude();
    protected final static int BUFFER_SIZE = 1024;

     * @see SSICommand
    public long process(SSIMediator ssiMediator, String commandName,
            String[] paramNames, String[] paramValues, PrintWriter writer) {
        long lastModified = 0;
        String configErrMsg = ssiMediator.getConfigErrMsg();
        String paramName = paramNames[0];
        String paramValue = paramValues[0];
        String substitutedValue = ssiMediator.substituteVariables(paramValue);
        if (paramName.equalsIgnoreCase("cgi")) {
            lastModified = ssiInclude.process(ssiMediator, "include",
                    			new String[]{"virtual"}, new String[]{substitutedValue},
        } else if (paramName.equalsIgnoreCase("cmd")) {
            boolean foundProgram = false;
            try {
                Runtime rt = Runtime.getRuntime();
                Process proc = rt.exec(substitutedValue);
                foundProgram = true;
                BufferedReader stdOutReader = new BufferedReader(
                        new InputStreamReader(proc.getInputStream()));
                BufferedReader stdErrReader = new BufferedReader(
                        new InputStreamReader(proc.getErrorStream()));
                char[] buf = new char[BUFFER_SIZE];
                IOTools.flow(stdErrReader, writer, buf);
                IOTools.flow(stdOutReader, writer, buf);
                lastModified = System.currentTimeMillis();                
            } catch (InterruptedException e) {
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
            } catch (IOException e) {
                if (!foundProgram) {
                    //apache doesn't output an error message if it can't find
                    // a program
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
        return lastModified;

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